A sea trip needs:

 Good weather forecast
 Different ways to communicate in case of emergency (by calling or sending a message)
 Good company and appropriate supplies (food, water, etc)

 BOAT: You will be given instructions about the right way that people should seat on the boat for fuel economy.
 CAPTAIN: He is the main person on the boat. That means everyone should follow his/her orders and he/she brings full responsibility about the boat and the safety of the people.
 ENGINE: Make sure that the engine is in the water.